Light guide plate and backlight unit having the same

Abstract

The present invention provides a light guide plate capable of improving brightness uniformity and a backlight unit having the same. The present invention also provides a liquid crystal display having such light guide plate and backlight unit. The light guide plate according to the present invention has a light incidence and a light emitting surface, wherein the light incidence surface is not perpendicular to the light emitting surface. The present invention utilizes the light guide plate capable of improving brightness uniformity across the light emitting surface so that the backlight unit and liquid crystal display may have considerably improved brightness uniformity.

1 . A backlight unit comprising: 
 a light source generating light; and    a light guide plate configured to transform the light from the light source into surface light, the light guide plate including:    a light incidence surface wherein the light generated from the light source is input into the light guide plate through the light incidence surface; and    a light emitting surface wherein the light input through the light incidence surface is emitted through the light emitting surface in the form of surface light, and wherein the angle which the light incidence surface and the light emitting surface of the light guide plate make with each other is less than 90°.    
   
   
       2 . The backlight unit of  claim 1 , wherein the light incidence surface of the light guide plate is a curved surface.  
   
   
       3 . The backlight unit of  claim 1 , further comprising a prism sheet including an array of micro-prisms disposed in parallel on a surface of the prism sheet, wherein the prism sheet is disposed in the backlight unit in such a manner that the array of micro-prisms faces the light emitting surface of the light guide plate.  
   
   
       4 . A backlight unit comprising: 
 a light source generating light; and    a light guide plate configured to transform the light from the light source into surface light, the light guide plate including:    a light incidence surface wherein the light generated from the light source is input into the light guide plate through the light incidence surface; and    a light emitting surface wherein the light input through the light incidence surface is emitted through the light emitting surface in the form of surface light, and wherein the angle which the light incidence surface and the light emitting surface of the light guide plate make with each other is larger than 90°.    
   
   
       5 . The backlight unit of  claim 4 , wherein the light incidence surface of the light guide plate is a curved surface.  
   
   
       6 . The backlight unit of  claim 4 , further comprising a prism sheet including an array of micro-prisms disposed in parallel on a surface of the prism sheet, wherein the prism sheet is disposed in the backlight unit in such a manner that the array of micro-prisms faces the light emitting surface of the light guide plate.  
   
   
       7 . A light guide plate configured to transform the light from a light source disposed adjacent to the light guide plate into surface light, the light guide plate including: 
 a light incidence surface wherein the light from the light source is input into the light guide plate through the light incidence surface; and    a light emitting surface wherein the light input through the light incidence surface is emitted through the light emitting surface in the form of surface light, and wherein the light incidence surface is not perpendicular to the light emitting surface.    
   
   
       8 . The light guide plate of  claim 7 , wherein the angle which the light incidence surface and the light emitting surface make with each other is less than 90°.  
   
   
       9 . The light guide plate of  claim 7 , wherein the light incidence surface is a curved surface.  
   
   
       10 . The light guide plate of  claim 7 , wherein the angle which the light incidence surface and the light emitting surface make with each other is larger than 90°.  
   
   
       11 . The light guide plate of  claim 7 , wherein the light incidence surface is a curved surface.